Undeliverable email internal user

Undeliverable email to internal user on outlook 2003
problem is jane can e-mail all but sue.
sue can e-mail jane and jane can reply back with no problem.
i have re-downloaded GAL to jane laptop did not work
i have tried typing sue name in the TO area then deleted the name did not work. the last thing is deleting profile which i do not want to do if i do not have too.